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chevy heads

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321countryboy

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so i recently bought a 1993 k1500. it had a blown head gasket so i tore down the motor to replace it an when i got the heads off i ran the number an they came up as 14102187 305 heads. my motor is a 350 but i heard that these smaller cc heads will make more compression being put on a 350 is this true?
also i heard they make better low end torque is this true and are they better then a set of 350 heads that would have came stock on them.
 
321countryboy said:
so i recently bought a 1993 k1500. it had a blown head gasket so i tore down the motor to replace it an when i got the heads off i ran the number an they came up as 14102187 305 heads. my motor is a 350 but i heard that these smaller cc heads will make more compression being put on a 350 is this true?
also i heard they make better low end torque is this true and are they better then a set of 350 heads that would have came stock on them.
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Did you verify the casting number on your block to be sure you have a 350? Those look to be stock tbi 305 heads. lower combustion chamber so it would raise your compression ratio for more power, but those heads have smaller valves. So not sure how much that will negatively effect performance.
 
Runnin 305ho heads on my k20. Good pieces, just they tend to run out of steam at higher rpm with the smaller valves though. Running the smallest comp 4x4 cam, works good in the cams rpm range of idle-4400.
 
Yeah I verified the number on the block that it was a 350. And it also appears to me that the motor has been rebuilt as the pistons say .60. But the po really overheated the motor because the piston that had the bad head gasket up on the head the paint had peeled off an where the crack on the head is is on the same piston where the blown head gasket was. So idk if I should be concerned about anything further in the motor or just get some new heads an run it.
 
I've got an old 350 that was "remanufactured" by some company, I think it was called 4-Star. Anyway, this reman 350 had 305 heads on it with dished pistons to keep the compression down. They even ground the casting # off the heads to try and hide it.

So if the pistons are dished, I'd go with another set of 305 heads. I know of an engine builder that swears by them, but he also ports the snot out of them and runs larger valves.
 
Yeah what gets me is where the front casting numbers on the block is suppose to be is totally gone like there never was any. I found the ones on the back that say 5.7 an something else
 
Get some vortec and deck them down if you want compression... 305HOs were like an 80s/90s trick. Just like the guys that still swear by camel humps that are out performed by out of the box vortecs...
 
Stomis said:
Get some vortec and deck them down if you want compression... 305HOs were like an 80s/90s trick. Just like the guys that still swear by camel humps that are out performed by out of the box vortecs...
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This :thumb:

I only did the 305ho heads as i was on a budget and couldnt afford a new intake.

Otherwise 062 Vortec`s are the way to go :thumb:
 
305 HO's were fine for Camaros, Montes, and lighter weight cars. They had the smaller combustion chambers to compensate for their lack of displacement to produce similar torque numbers to a 350 of the time. Unfortunately, heavy trucks prefer displacement, I think a lot of people had detonation issues with them. Since 350's are so cheap and Vortec heads easily available, most people don't even bother with them anymore. Good for you for making a budget solution though!
 
New vortecs are like $650 new for the pair from summit. That's almost free as far as pricing for good cylinder heads. And they have a reasonable combustion chamber size for the sbc.
 
79rustyk10 said:
New vortecs are like $650 new for the pair from summit. That's almost free as far as pricing for good cylinder heads. And they have a reasonable combustion chamber size for the sbc.
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Personally, the "cheap" price frustrates me. They used to be less than 400 bucks for a pair, now THAT was a good deal.
 
USSkoval said:
Personally, the "cheap" price frustrates me. They used to be less than 400 bucks for a pair, now THAT was a good deal.
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And then people figured out what a great value they were and the price went up, lol. I got a set of new GM Vortecs from Scoggin Dickey for about 650 with shipping, still a great value for a streetable, reliable motor with a performance boost.
 
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